#include <stdio.h>

#define ROWS 6

int main(void)
{
    int row, col;
    char ch = 'A';

    for (row = 0; row < ROWS; row++)
    {
        for (col = 0; col <= row; col++, ch++)
            printf("%c", ch);
        putchar('\n');
    }

    return 0;
}